TW201942599A - Varifocal lens module - Google Patents

Abstract

A varifocal lens module, consisting of a casing provided with a holding chamber, an opening end, an interconnecting hole, a soft lens disposed on the casing to seal the holding chamber, and a medium control device connects to the interconnecting hole. The soft lens is provided with a first curved surface having a first curvature exposed external of the casing and a second curved surface having a second curvature positioned interior of the holding chamber corresponding to the first curved surface. The medium control device is connected to the interconnecting hole for controlling the volume of the medium inside the holding chamber, whereby the change in volume of the medium changes the compression on the second curved surface, thereby modifying the second curvature of the second curved surface, producing a variation in the spacing between the second curved surface and the first curved surface to achieve a varifocal effect.

Description

Variable focal length lens module

The invention relates to a lens module, in particular to a lens module with a variable focal length.

The zoom lens module is widely used in smart phones or cameras to make the imaging effect clearer by changing the focal length.

Existing variable-focus lens modules, such as the Republic of China Publication No. I363202 Invention Patent, disclose a lens module capable of adjusting the curvature of a lens. The lens module is mainly provided with a lens group in a frame, and the lens group has A base lens, and at least one soft lens is provided on at least one side of the base lens, and a gap is provided between the base lens and the soft lens, and one side of the frame body has an entrance communicating with the gap. The inlet is connected to a liquid supply device, and a liquid is contained in the liquid supply device to inject the liquid in the liquid supply device into the gap of each lens through the inlet of the frame by a control device. To change the curvature of each lens.

However, the invention patent No. I363202 mainly deforms the soft lens as a whole through the liquid to achieve the effect of changing the curvature. When the soft lens is deformed as a whole, the two corresponding surfaces of the soft lens are deformed simultaneously. Therefore, when the soft lens is deformed, the curvature change between the two corresponding surfaces cannot be accurately grasped. In this way, it is impossible to accurately grasp the change in focal length and produce the phenomenon of stray light.

For another example, the Republic of China Announcement Patent No. I402599 discloses a lens module and a camera module, including: a lens barrel, and a sidewall of the lens barrel is provided with at least one vent hole. A first lens is housed in the lens barrel, and the first lens is fixedly disposed in the lens barrel. A second lens housed in the lens barrel, the second lens has a main body portion and a peripheral elastic portion surrounding the main body, and the peripheral elastic portion is closely matched with the lens barrel. The second lens, the first lens, and the lens barrel define a space, and the space is in communication with the at least one vent hole. And a pressure control device, which is in communication with the at least one vent hole and is used for changing the air pressure in the space, thereby driving the second lens to move relative to the first lens.

However, the invention patent No. I402599 mainly achieves the effect of zooming by changing the distance between the first lens and the second lens. Although this method can effectively control the change in curvature, it will cause the volume of the lens module as a whole to be increased, and it cannot be applied to a thin smartphone or camera.

Therefore, how to provide a lens module that can be used in a smart phone or a camera and has a small size and can effectively grasp the zoom focal length is the technical means and its purpose to be solved by the present invention.

The main object of the present invention is to provide a lens module with a small focal length and a variable focal length which can effectively grasp the focal length of the zoom.

To achieve the above object, the variable-focus lens module of the present invention includes a casing, a soft lens, and a medium control device. The housing has a receiving chamber, an open end communicating with the receiving chamber, and a communication hole. The soft lens is disposed at the open end of the casing to close the chamber. The soft lens has a first lens exposed to the outside of the casing and having a first curvature. A curved surface and a second curved surface located inside the container chamber and opposite to the first curved surface and having a second curvature. The medium control device is in communication with the communication hole, and is used to control the volume of a medium in the volume, so as to use the volume change of the medium in the volume to squeeze the second curved surface, and change the second curved surface. The curvature changes the distance between the second curved surface and the first curved surface.

In an embodiment, the housing further comprises an outer shell and a sealing plate, the open end is provided at the top of the outer shell, the communication hole is provided at one side of the outer shell, and the receiving chamber is formed by The outer shell is composed of the sealing plate.

In an embodiment, the outer casing is further made of a light-tight hard plastic.

In one embodiment, the soft lens is directly formed at the open end of the outer casing by injection molding.

In one embodiment, the sealing plate is further made of a light-transmitting rigid plastic.

In one embodiment, the soft lens is further made of a light-transmissive soft material.

In one embodiment, the soft material is silicone.

In one embodiment, the first curved surface is a convex lens.

In one embodiment, the second curved surface is a concave lens.

In one embodiment, the medium is further selected from a liquid or a gas.

Compared with the conventional technology, the variable focal length lens module of the present invention has the following advantages:

1. The present invention can pass the volume change of the medium in the container to The second curved surface is compressed, and then the second curvature of the second curved surface is changed, so that the curvature change of one side of the second curved surface achieves the effect of the variable focal length, so as to effectively control the focal length of the zoom.

2. The present invention can effectively reduce the volume of the lens module through the curvature change on one side, and is further applied to a thin smartphone or camera.

10‧‧‧shell

101‧‧‧ Outer shell

102‧‧‧sealing plate

11‧‧‧Room

12‧‧‧ open end

13‧‧‧Connecting hole

20‧‧‧ soft lens

21‧‧‧first surface

22‧‧‧ second surface

30‧‧‧Media Control Device

40‧‧‧ Medium

50‧‧‧Photographic Module

51‧‧‧Mirror mount

52‧‧‧Image Sensor Module

53‧‧‧Circuit Board

FIG. 1 is a cross-sectional view of a lens module according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an embodiment of the present invention applied to a camera module.

3 is a cross-sectional view of the soft lens in the lens module shown in FIG. 1 after a second curvature change.

The detailed description and technical contents of the present invention are described below with reference to the drawings:

As shown in FIG. 1, the present invention is a lens module with a variable focal length, which includes a housing 10, a soft lens 20 and a medium control device 30.

Specifically, the casing 10 has a receiving chamber 11, an open end 12 communicating with the receiving chamber 11, and a communication hole 13 provided on one side of the casing 10 and communicating with the receiving chamber 11. In this embodiment, the casing 10 is composed of an outer casing 101 and a sealing plate 102. The outer casing 101 is made of a hard-opaque hard plastic by injection molding. The open end 12 is located at A top end of the outer casing 101 and the communication hole 13 are located on one side of the outer casing 101. The sealing plate 102 is formed of a light-transmitting rigid plastic. The sealing plate 102 is fixed at a position of the outer casing 101 with respect to the open end 12 by means of high frequency and the like, so as to be closed by the sealing plate 102. The housing 101 forms the receiving chamber 11.

The soft lens 20 is disposed on the open end 12 of the outer casing 101 so that the receiving chamber 11 forms a closed space. In this embodiment, the soft lens 20 is integrally formed at the position of the open end 12 by using a light-transmissive soft material such as silicon rubber by injection molding, so that the soft lens 20 is combined with the outer casing 101 One. The soft lens 20 has a first curved surface 21 exposed to the outside of the housing 10 and a second curved surface 22 located in the chamber 11. The first curved surface 21 has a first curvature and the second curved surface 22 has a第二 表面。 The second surface. The first curved surface 21 forms a convex lens, and the second curved surface 22 forms a concave lens.

The medium control device 30 communicates with the communication hole 13 provided on one side of the casing 10. The medium control device 30 is used to inject a medium 40 into the container 11 through the communication hole 13. In this embodiment, the medium 40 may be selected from one of a gas or a liquid. When the medium 40 is injected into the chamber 11 through the communication hole 13 by the medium control device 30, the medium 40 is changed in the chamber. Volume within 11

As shown in FIG. 2, when the variable-focus lens module of the present invention is applied to a photographing module 50, the photographing module 50 includes a lens holder 51, an image sensing module 52, and a circuit board 53. The housing 10 is used to connect with the lens holder 51 so that the sealing plate 102 is located above the image sensing module 52, and the image sensing module 52 is electrically connected to the circuit board 53. The circuit board 53 is disposed in the lens holder 51.

Referring to FIG. 1, the first curvature of the second curved surface 22 of the soft lens 20 is an initial shape. At this time, the volume of the medium 40 is less than or equal to the volume of the chamber 11. Please refer to FIG. 3, when the medium control device 30 is turned on, so that the medium 40 enters the inside of the accommodating chamber 11 through the communication hole 13, as the volume of the medium 40 in the accommodating chamber 11 increases, the outer casing 101 Both the sealing plate 102 and the sealing plate 102 are made of hard plastic, and the soft lens 20 is made of silicon rubber. When the volume of the medium 40 in the chamber 11 gradually increases, the medium 40 will squeeze the second curved surface 22 of the soft lens 20, so that the second curvature of the second curved surface 22 changes, so that the first The two curvatures gradually increase, and the second curved surface 22 is gradually approached toward the first curved surface 21 to shorten the distance between the first curved surface 21 and the second curved surface 22.

After the medium 40 returns to the medium control device 30 through the communication hole 13, the volume of the medium 40 in the chamber 11 gradually decreases, and the soft lens 20 can gradually return to the original state through the elasticity of the silicone. It is possible to change the second curvature of the second curved surface 22 through the medium 40, thereby achieving the effect of a variable focal length.

It is worth mentioning that the present invention mainly changes the second curvature of the second curved surface 22 by changing the volume of the medium 40 in the container 11. In this way, compared with the prior art, the present invention can achieve the function of variable focal length by changing the curvature of a single curved surface of the soft lens 20, which can not only effectively control the change of focal length, but also achieve the advantages of reducing the volume , And then can be applied to thin smartphones or cameras to meet the requirements of thin.

In summary, the present invention has indeed met the requirements for an invention patent, and a patent application was filed in accordance with the law. However, the above is only the preferred embodiment of the present invention, and the scope of patent application in this case cannot be limited by this. For example, all modifications or changes made by those familiar with the art of this case with the help of the spirit of the present invention should be covered by the following patent applications.

Claims (10)

A variable-focus lens module includes: a casing having a receiving chamber, an open end communicating with the receiving chamber, and a communication hole; and a soft lens provided at the open end of the casing to close the opening. In the accommodating chamber, the soft lens has a first curved surface exposed to the outside of the housing and having a first curvature, and a second curved surface located inside the accommodating chamber and opposite to the first curved surface and having a second curvature; And a medium control device in communication with the communication hole for controlling a volume of a medium in the volume to squeeze the second curved surface by using the volume change of the medium in the volume to change the second curved surface. The second curvature changes a distance between the second curved surface and the first curved surface. The variable focal length lens module according to claim 1, wherein the housing further comprises an outer casing and a sealing plate, the open end is provided at the top of the outer casing, and the communication hole is provided in the casing. One side of the outer casing, and the containing chamber is composed of the outer casing and the sealing plate. The variable-focus lens module according to claim 2, wherein the outer casing is further made of an opaque hard plastic. The variable-focus lens module according to claim 3, wherein the soft lens is directly formed at the open end of the outer casing by injection molding. The variable-focus lens module according to claim 2, wherein the sealing plate is further made of a light-transmitting rigid plastic. The variable-focus lens module according to claim 1, wherein the soft lens is further made of a light-transmissive soft material. The variable focal length lens module according to claim 6, wherein the soft material is silicon rubber. The variable focal length lens module according to claim 1, wherein the first curved surface is further a convex lens. The variable focal length lens module according to claim 1, wherein the second curved surface is further a concave lens. The variable focal length lens module according to claim 1, wherein the medium is further selected from a liquid or a gas.